Leatrix Plus is an efficient and modular addon which offers lots of quality of life improvements to enhance the default user interface in Shadowlands.
Click the minimap button or enter /ltp to open Leatrix Plus. Some options have little configuration buttons next to them for further configuration. For a list of slash commands, enter /ltp help. If you're looking for map enhancement, there is now a standalone addon called Leatrix Maps. If you are looking for Leatrix Plus for Wow Classic, it's here.
Automate quests - Automatically select, accept and turn-in quests. Quests which have a gold, currency or crafting reagent requirement are excluded automatically.
Automate gossip - Automatically select a single gossip option by holding down the alt key when opening a gossip window.
Accept summon - Automatically accept summon requests.
Accept resurrect - Automatically accept resurrection requests (with exclusions for combat, pylon and brazier resurrection).
Release in PvP - Release automatically after you die in a battleground or world PvP zone.
Sell junk automatically - Sell all grey items in your bags when you talk to a merchant. Merchants which refuse to buy items are excluded automatically.
Repair automatically - Repair your armor automatically (using guild funds if possible or character funds if not) when you talk to a repair merchant.
Block duels - Block duel requests from people who are not friends or guild members.
Block pet battle duels - Block pet battle duel requests from people who are not friends or guild members.
Block party invites - Block party invite requests from people who are not friends or guild members.
Block friend requests - Block BattleTag and Real ID friend requests.
Party from friends - Automatically accept party invitations from friends or guild members.
Sync from friends - Automatically accept party sync requests from friends or guild members.
Queue from friends - Automatically accept requests initiated by your party leader to join the Dungeon Finder queue.
Invite from whispers - Automatically invite someone to a group when they whisper the keyword inv to you.
Use easy resizing - Resize the chat frame upwards simply by dragging it.
Hide the combat log - Hide the combat log to make more room for chat windows.
Hide chat buttons - Hide the chat buttons to gain screen space.
Hide social button - Hide the social button and quick-join notification.
Unclamp chat frame - Move the chat frame to the very edge of the screen.
Move editbox to top - Move the editbox to the top of the chat frame.
Disable sticky chat - Disable sticky chat so you can switch between group chat and whispers easily.
Disable sticky editbox - Automatically close the chat editbox when it loses focus.
Use arrow keys in chat - Use the arrow keys to navigate the editbox.
Disable chat fade - Prevent chat text from fading.
Universal group color - Make raid chat text the same color as party chat text.
Recent chat window - Open recent chat history in a copy-friendly window.
Increase chat history - Increase chat history from 128 lines to 4096 lines.
Hide error messages - Hide error messages shown in the error frame (with exclusions for a few important errors).
Hide portrait numbers - Hide the damage and healing numbers shown in the portrait and pet frames.
Hide zone text - Hide zone text (such as 'Ironforge').
Resize mail text - Resize text in the mail frame.
Resize quest text - Resize text in the quest detail frame.
Enhance minimap - Rescale the minimap, hide zone information, hide the clock and use the mousewheel to zoom.
Enhance tooltip - Move, rescale and color the tooltip and show useful information such as target and guild rank.
Enhance dressup - Add tabard and nude buttons, prevent special model animations and hide the character controls.
Show volume slider - Add a useful volume control to the character sheet.
Show cooldowns - Show up to five beneficial cooldown icons (of your choice) above the target frame for easy cooldown tracking.
Show durability status - Show itemised durability status in the character sheet and show an overall percentage after you die.
Show pet save button - Save your pet battle team to a slash command for easy team assignment.
Show raid button - Move the raid frame toggle button so that you can toggle the raid container frame without opening the raid management frame.
Show borders - Show customisable borders around the edges of the screen.
Show player chain - Show a rare, elite or rare elite chain around the player frame.
Show Wowhead links - Show Wowhead links in the achievements frame and world map frame.
Manage frames - Move and rescale the player frame, target frame, ghost frame and mirror timer bar frame.
Manage buffs - Move and rescale buff frame.
Manage power bar - Move and rescale the alternate power bar frame.
Manage widget - Move and rescale the widget frame (commonly used for PvP scores).
Class colored frames - Show the player, target and focus frame backgrounds in class color.
Class icon portraits - Show class icons in the portrait frames.
Hide alerts - Hide alerts (such as loot and achievements).
Hide bodyguard gossip - Prevent the gossip window from opening when you talk to an active bodyguard.
Hide talking frame - Hide the talking frame.
Hide clean-up buttons - Hide the backpack clean-up button and the bank frame clean-up button.
Hide boss banner - Hide the banner that normally appears when a boss is defeated.
Hide level-up display - Hide the banners used for encounter objectives, level-ups, etc.
Hide gryphons - Hide the gryphons shown either side of the main bar.
Hide stance bar - Hide the stance bar.
Hide order hall bar - Hide the order hall command bar.
Graphics and sound
Disable screen glow - Disable the screen glow to reduce nausea.
Disable screen effects - Disable the grey screen of death and the netherworld effect.
Set weather density - Set the density of weather effects or remove weather completely.
Max camera zoom - Increase the maximum camera distance to get a bigger view of the action.
Silence rested emotes - Automatically toggle emote sounds when you enter and exit rested state and pet battles.
Mute game sounds - Mute a selection of game sounds (such as spell fizzle, worgen sniffing and battle shouts).
Disable bag automation - Prevent your bags from opening or closing automatically when you interact with a merchant, bank or mailbox.
Disable pet automation - Stop battle pets from being automatically summoned.
Show character addons - Sort the addon list according to character by default.
Remove raid restrictions - Allow party group to raid group conversion to succeed even if your group contains low-level characters.
Disable loot warnings - Hide the warnings that appear when you choose a loot roll option or attempt to sell or mail a tradable item.
Save profession filters - Save profession filter settings so you don't need to keep selecting them every time you open a profession window.
Faster looting - Loot creatures significantly faster.
Faster movie skip - Cancel cinematics without being prompted for confirmation.
Combat plates - Show nameplates automatically when combat starts.
Easy item destroy - Destroy superior items without the need to type delete and show links in all item destroy windows.
Lockout sharing - Permanently disable achievement point sharing.
Media player - Thousands of game music tracks and all of the playable cinematics in an easy to use, categorised and searchable media library.