Select something in your drawing, when it's still selected open customize meny, then you can click in the Field you want to change, typical the layername field, move the mousecursor to the rigth side edge of it and there will turn up a symbol that tell you that you now can drag the edge to rigth or left, when the symbol is visible, click and drag it to where you want., then ok out of that menu
It seems like you have Classic, open Options/ Desktop and under "Inspector Bar" you can change to use Compact if you want and also to the rigth from there set the pixel for Field Width, i have on 55, i believe that is common size.
After that/ and you can just move the cursor over the rigth side of each Field in the InspectorBar and drag it to the size you want to have it.
V20, V21, 2015/ 16/ 17/ 18/ 19 Pro. Platinum
Deluxe 2015/ 16/ 19
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB