Games do not start with a double click because the wrong emulator starts

[Der Barde aus dem Tale]

I installed the Atari ST with "Retroarch" as emulator. Since Retroarch did not work, I now have Steem SSE installed. 
Stemm SSE is now also the standard emulator for Atari ST. Retroarch no longer has an entry for Atari ST because I deleted the entry. 
The Atari ST context menu still contains Retroarch. Therefore, no Atari game starts with a double-click. 
Launchbox still tries to use Retroarch, though that does not work. What do I have to do to replace the old emulator with the new one?

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[Lordmonkus]

Select all the games in your Atari ST platform using Control + A, then press Control + E to bring up the bulk edit tool. In the first drop down menu pick emulator and then in the second drop down menu choose the emulator you want to use.

[Der Barde aus dem Tale]

 

Many many thanks!!! It worked immediately and I learned a lot again ...

[Lordmonkus]

No problem, the bulk edit tool is something that is too hidden from new users and needs to be more prominent, also the "make default emulator" check box needs to ask if you want to change your emulator for the platform when you tick it. This is on the to-do list for eventually lol.