The suggestion is to keep text selection in Obsidian’s PDF Reader when switching to another tab, as it works with tabs that contain regular markdown files.
At the moment, if you select text in PDF Reader, switch to another tab and then switch back to PDF Reader, the text selection is reset - this is especially annoying when you need to copy part of the text and then link to it - you have to select it again.
I have not found any related requests.