By default a marking key acts where you are and does not move on. Turn on advancing in Settings → Browsing, and then holding ⇧ does the opposite for one press. The command names in the app flip to match, so the menu always tells the truth.
| Keys | Command | Where |
|---|---|---|
| T | Toggle tag | Grid, preview, video |
| ⇧T | Tag and advance, or tag without advancing | Grid, preview, video |
| U | Untag | Grid, preview, video |
| X / ⇧X | Reject or clear rejection / use the alternate advance behavior | Grid, preview, video |
| R / ⇧R | Mark Reviewed; Shift reverses the review advance preference | Files and Apple Photos |
| no key | Mark Unreviewed; Protect / Unlock Photos | Files and Apple Photos |
| ⌫ | Delete selected photos; confirmation is on by default | Grid, preview, video |
| 1 … 5 | One star to five stars. Pressing the rating it already has clears it. | Grid, preview |
| ⇧1 … ⇧5 | The same, with the opposite advance behavior | Grid, preview |
| 0 | Clear the rating | Grid, preview |
| 6 7 8 9 | Label red, yellow, green, blue. The Lightroom keys and the Lightroom names. | Grid, preview |
| ⇧6 … ⇧9 | The same, with the opposite advance behavior | Grid, preview |
| ⌥9 | Label purple | Grid, preview |
| ⌥0 | Clear the label | Grid, preview |
| no key | Clear all tags, with a confirmation |
Tag, rating, label, and review actions have separate advance settings. With multiple photos selected, T tags all of them, or clears their tags when all are already tagged. Viewing alone does not mark a photo reviewed. Protected photographs are skipped with an explanation.
A mark applies to every selected photograph, or to the one under the focus ring. On a collapsed bracket stack it applies to every frame in the stack.