Hello JoAb, thank you for the comments.

There is a toolbar icon for the extension. It is a yellow star with a "+" sign inside it. Maybe you removed it or you have something hiding it ? In the first case, try "additional tools" on far right of the toolbar, then "customize toolbar" .. and you should find it and be able to drag it back to the toolbar.

On the thing you suggest for "show search", this is not easily possible. but also this wouldn't match the frequent behavior that users often search for a boookmark to find where to drag a new bookmark which they want to put / create in that same folder and around the same place => they need to see the full contents of the folder around the searched bookmark to place the new bookmark.
By the way, this is exactly reproducing the behavior of the initial Bookmark Search Plus extension (pre-Quantum), which BSP2 is replacing.

Thank you, aaFn.

******** Edit ************************
On second thought, a proposal I could make is to add an action to the right click context menu which would be "Go parent folder" .. and it would jump you directly to the parent 100 rows above without you scrolling for it.
That action could be both in the main bookmark and in the search result panes .. what do you think ?

If that looks good to you, would you mind opening it as an issue on https://github.com/aaFn/Bookmark-search-plus-2/issues ?

Cheers, aaFn.

******** Edit again ******************
Never mind, on third thought, I believe this is a useful feature for all, so I opened the issue myself
https://github.com/aaFn/Bookmark-search-plus-2/issues/55
and implemented the function in 2.0.34.

AaFn.