Stick global search
When we scroll down the menu on the left, we don't see anymore the search field. I propose to stick the search field on the top, and maybe instead of the left panel we could put it on the top bar (in the middle).
I don't know how difficult is it to do but I imagine also that something like a super search field would be handy. In addition to search on the menu, it could search (with auto-suggestion) on any record. On many cases it could avoid some actions. Like instead of searching for the menu Party, then it opens the tab, we search for the party, it shows the line, you click on it and eventually the record is opened. The super search would let you directly put the name or code of the Party and open the record in one click.