Tahoe: shift-command-D in mail does not work

installed Tahoe.

apart from the many new things to get used to, there are som things that seem not to work properly.

one of them is in Tahoe: the shift-command-D in mail does not work.

I use Spark as well, it has the same keystroke and there it also does not work.

On my iMac at work it does work, it is only here

• use tahoe 26.0.1 (25A362) on a Mac Studio M1

Is this a bug?