Even new projects seem to exhibit this behavior. To solve this problem, here is the hack I found to fix the problem. Unfortunately, you need to do this for each project:
- Select Edit Scheme: CMD + <
- In the "Run" → "Information" section: change the Assembly Configuration from "Debug" to "Release". Then change it to "Debug"
- Click Close
- Go to the simulator you want to use and close the project.
After re-opening the project, he must remember on which simulator you left it. Hope this helps you!
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