Lower quality reduces the studio viewport's pixel density for better performance on slower devices. Doesn't affect the final render output. Depth of field preview is only visible at High quality; the final render always applies it.
Undo history depth
50
Maximum number of undo steps retained per session. Higher values use more memory.
When on, the current scene is continuously saved and restored on next load. Turn off if you'd rather manage saves manually with Ctrl+S.