Freeing up space · Emergency Space
Why are some options in Emergency Space not ticked for me?
Short answer: Anything that removes data is never ticked for you, however full the disk; only reversible options may arrive selected. Rows Storage Studio couldn't confidently identify are left unticked too, with the reason.
Because the options left unticked are the ones that cost you something. Reversible options may arrive already ticked; anything that removes data never does, however full your disk is. A screen that pre-ticks deletions is a screen that deletes things you didn't read.
A row Storage Studio couldn't confidently identify is also never ticked for you, and says why — have a look inside before you choose it. And a row whose app is open right now says you'll be asked to quit it first. See what a caution on a row means.