This mod does 3 simple things:

Make it possible to sell/buy from/to camp chests and companions in your camp.
Allows you to select (with shift or ctrl) and drag multiple items/stacks in Barter. This is the fastest way to get rid of non-wares junk. No stacks splitting, no multiple draggings.
Removes everything unnecessary from Trade menu (paperdolls, equipment menu, decor etc) to increase Trade and Barter grids.

Installation:
Manually drop pak file from archive to Mods folder (Appdata\Local\Larian Studios\Baldur's Gate 3\Mods) and enable it in in-game mod manager. Or use BG3MM/Vortex.

Install only one version.

Uninstallation:
Disable/uninstall mod in in-game mod manager or in BG3MM/Vortex. Don't delete pak manually in Mods folder.
When uninstalling version installed via in-game mod manager from mod.io, unsubscribe on mod.io, otherwise in-game mod manager will try to install it on background again.

Compatibility:
KB/M only, controllers UI without changes. Made to look great on any aspect ratio (use 16:9 version for UW).
Should be compatible with any other mod that doesn't edit the same widget.

Better Trade Menu