i can't customize my shortcut keys. For instance, when I change the record shortcut "R" to "M" it shows "M" in the Shortcut list, but it doesn't work in the program. Only "R" still works when I want to capture video. I've tried it in Magix 2021, 2023 and 2025. with no success.
I don't know why one would want to do this, but I had no problem doing this in 2025 Suite.
M is the shortcut for the Mixer. I presume that you clicked on "Assign keyboard shortcut" after putting M in the white box. When you tried, there should have been a message pop up stating that M is already being used and asking if you want to replace it.
If you say yes, 2025 adds it to the keyboard shortcut but R is still there.
When you try, either M or R should now open the Record interface. Now, you'll have no shortcut for the Mixer.
You can go back and delete the R and use it for something else.