Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
@Peter Diederich
Currently in Microsoft Q&A we only support English, could you please edit your question into English?Thanks for your understanding.
Via translate tool I get the following content, any misunderstanding, you may post back.

Under what specific circumstances will you meet this issue?
Does Access automatically minimized to the taskbar just after opening?
Please hold on Shift and Ctrl key, right click on the Access icon on the taskbar, try to choose Minimize first and then Maximize.
Would this issue be reproduced on other Office apps?
Please go to Control Panel to perform a Online Repair for Office.
Do you have multiple monitors set up on your computer?
If yes, please just keep your primary monitor to check this issue.
Any updates, you may post back.
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