How do I remove Images Toolbar from thumbnail view? When I first got DO, I didn't know what I was doing and just deleted all the icons there, but that leaves wasted space, because the bar is still there. I thought the setting below would remove it, but it doesn't.
If it’s still there (presumably in all modes now, not just thumbnails), right click an empty area on the toolbar and choose Close, then use Settings > Toolbars > Set As Default Toolbar Set.
With the less-cropped screenshot, I can now see you've added the Images toolbar to your file display border. It can be removed in the same place it was added: Preferences / File Displays / Border.