You can hide individual elements or categories of elements in a view permanently or temporarily.
When you hide an element that is used as a reference for a tag or a dimension, the tag or dimension is also hidden. Hiding a revision cloud does not affect the Sheet Issues/Revisions table. That table always shows all revisions in the model. Hiding a revision cloud can affect the revision schedule on a sheet. If that revision no longer appears on a sheet it would be removed from the schedule (by default).