Gallery is a Windows 11 aggregator photo feature.
If you like to remove it, due to privacy concerns, there are several methods, like register keys, powershell, gpo etc etc.
Here it is a way. --> start --> regedit with administrative rights
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows
CurrentVersion
Explorer
Desktop
Namespace
select key {e88865ea-0e1c-4e20-9aa6-edcd0212c87c} and remove it
[original articles]
https://www.claudiomasci.com/come-rimuovere-galleria-da-windows-11/
https://www.ninjaone.com/it/blog/aggiungere-o-rimuovere-la-galleria-da-esplora-file-in-windows-11/