Windows keyboard shortcut problems

Hi, as per object I would like to describe my problem more precisely.
We have installed on our MACs (Bigsur v11.2) Parallel Desktop Business (Version 16.1.3).
We use a company program called SAP, with this program installed on Windows 10 with Paralell in creating new offers we encounter problems.

We have created through the menu "Devices> Keyboard> Customize" the rule from CTRL and TAB to CTRL and TAB, but we cannot use this function.

We solve with inserting the keyboard from "Devices> USB & Bluetooth> Apple Keyboards". But so we remove the use of the keyboard from the mac.

Is there a way to automatically switch the keyboard from mac to windows without the procedure described above?