There are a few instances of this i have noticed. in VM3 you could "select all" for places like Shipping countries and categories and Payment methods for countries and categories - now it is half a days job selecting all those countries you dont want to ship to!!
Select all works with VM4.0.12 on J3.10.11 but not on J4.x.
(https://i.ibb.co/BGjM75s/selectall.jpg) (https://ibb.co/KD7vQpy)
Yep ok i assumed you guys would probably be aware
There is a trivial way to remove it all. In your browser (preferably Edge) run the inspection (source code).
In HTML Find this <select></select> section and remove everything. After that, save the settings in Virtuemart
:)
Or you can write a simple javascript with a button that clears it.
I made a similar one for custom fields (a button to select all fields so that they do not inherit or a button to remove all custom fields - useful if there are a lot of them.
https://forum.virtuemart.net/index.php?topic=147849.msg527457