Can't add instrument to B+B editor when B+B has no vertical space left

I have many samples and intruments in B+B editor and there is no vertical space left on the screen. I didn't find a way to add instrument plugins from left side to B+B editor. Only way is to drag and release on existing instrument and by replacing it.

Samples and presets can be added by right click and Open in new instrument-track/B+B Editor. I believe this context menu can be useful for instrument plugins also.

Start by reproducing the issue in the B+B editor with no vertical space left, then compare the existing right-click behavior for samples and presets. Done means instrument plugins can be opened from the left side through an equivalent context-menu action without replacing an existing instrument.

Written by the indexing model from the issue text.