You need to be an admin on the instance, and on the web client. Once you are there, click on the profile picture/initials and click on “Apps”. The app store should open.
This is my first rice, it's a simple one but not really "just the defaults".
Even though it wasn't captured in the screenshot, the mouse cursor is also changed.
The wallpaper is this one, from WallpaperCave.
I'm using the Latte Dock, but the above bar is a Plasma panel, not a Latte panel.
No, as the AirTags use Apple’s Find My network, and there’s no app for Find My on Nextcloud as of right now.
No, I'm replacing it with Lemmy.