And always keep full screen Chart as a preset button ...

1 preset button click to have instant access to Chart zoom (+ or -) ...without having to worry which side of a Chart/x combo view is active ...and then change that active side to the Chart side - then exit out of the menus = before You can even zoom the Chart ...

The Chart zoom level (in a Chart/x combo view) will be at the zoom level selected in the full screen Chart view (after returning to the Chart/x combo view) ...

Rickie