In the "Select Cell" dialog, could you place the "Show all cells" tick box to the north of the window, above the cell list, rather than below the cell list? The reason for this request are:

• There would be less mouse travel between the "Filter" field and the "Show all cells" tick box.
• Under Windows, the "Select Cell" window opens with the north of the window under the mouse cursor, which requires mouse travel to the bottom of the window to check or uncheck the tick box

Reference:
https://www.klayout.de/forum/discussion/2742/interface-ergonomics-detail-when-adding-a-cell-instance#latest