In Lemmy, you hide text blocks behind a spolier ":::" tag:

Go to: https://lemmy.world/c/hardware, and you'll get the following via the (default?) Lemmy webUI:

If you go to https://piefed.social/c/hardware@lemmy.world (!hardware@lemmy.world) via the Piefed webUI you get the following view in the same siderbar:

If possible, it would be helpful to have the spoiler tag work in Piefed webUI as well.