In the old Elements window of Math it was possible to select formulas with the keyboard according to:
Now the Elements window is gone and its functionality is available in a side pane, but I can't navigate to the formulas with the tab (or any other) key and insert a formula to the Commands window.
All I can do is to select the category listbox and choose another category from that.
I think it would be nice to have back this accessibility feature.
*** This bug has been marked as a duplicate of bug 65587 ***