Ghost Shield

Ghost Shield is a lightweight resource pack compatible with all Minecraft versions since the shield's release. It adds the two following features.

Hidden Shield:
The shield is not visible when it's held in the offhand and not in use. It'll show again when blocking.

Lower Shield:
Ghost Shield lowers the shield in first-person for better visibility.

Credits:
Vanilla Tweaks (for the lower shield): https://vanillatweaks.net/
Passive Shield (for the idea):
https://www.curseforge.com/minecraft/mc-mods/passive-shield
https://modrinth.com/mod/passive-shield