Tag dialog is not persistent. A persistent save, reset, cancel dialog would be helpful. It seems that the app automatically saves the tag when you check it but you may not want to save it, and having to remember which ones you checked to uncheck them is hard to mentally maintain and the reset would help with that. Tag dialog is short and narrow. The dialog does not expand to see more of the tags. If you have hundreds of tags, seeing 10 at at time is limiting. Being able to expand it vertically to the bottom off the app screen would lessen scrolling and help speed up tagging. There is a search feature but that requires you to move your hand off the mouse and breaks tagging flow. The tag dialog uses a list view of tags which limits how many can appear on screen at once. A river flow button style like the list of tags actively saved in the picture would allow you to see more in the same amount of space as a vertical list. If you make the change for river flow then you can go to a color coding system of dark grey, light grey, outlined. When using a tag list it doesn't represent the actual status of the multiple photos selected. It will show checks on all tags regardless if some photos don't have the tags. A check, unchecked, hyphen system would better representative of status. If a photo doesn't have a tag you have to uncheck the tag and recheck it to update a photo missing the tag. That way you can check a hyphen to add the tag to the photos missing them. There is no option to sort the tag selector either by ascending or descending. Or more usable types like recently added, recently used, most used. You could create tag groups of recently added, most used, and recently used and then an All group. Have the ability to show or hide the ones you want. I hardly ever need to scroll through all the tags when I'm only using the top 30 or 40 tags. There is a search feature but that requires you to move your hand off the mouse and breaks tagging flow. Currently the tags fall off the bottom edge of the photo, it kind makes the UI look broken. They do move up on hover but it would be nice if they always appeared or an option for it. Maybe giving an option to use a simple text list instead of buttons style for a more compact viewing. Making things easier to compare photos tags without having to hover over both.
