I see what you're saying, it does make sense why it is behaving this way. However, it makes the program much more frustrating to use; if the library window cannot be made to stay on top of the working window, perhaps an option to customize sidebars/toolbars as one can in Illustrator would be considered? If I could drop the library tab into the right sidebar as I do in other programs, it would be a nonissue. I do use the program on full screen currently.
Edit: This is XD Version 22.214.171.124
Computer: HP ZBook Studio G3 running Windows 10
Whenever I try to use CC libraries, the modal disappers behind the main XD window whenever I click back to the artboard. To work around this, I must select the item I would like to change, bring the CC library modal back to front, and select the CC item I would like. My coworkers on Mac do not have this issue; their CC Library modal remains on top during their workflow.
2,070 votes114 comments · Adobe XD: Feature Requests » 01 : Design mode · Flag idea as inappropriate… · Admin →
If you want rulers so you can create guides for snapping, please upvote: https://adobexd.uservoice.com/forums/353007/suggestions/14160453-guides
If you want rulers for a different purpose, please upvote this request and leave a comment telling us more about your use case.