If you also come across the issue, this post fromMiniToolis what you need.
Some users report that they meet the Choose where to get apps is missing issue.
Then, the following part introduces how to fix the issue.

If your Windows 11 apps are not opening or working, do you know how to solve the issues?
This post shows you some easy and effective solutions.
However, you cannot install third-party applications on your gear in this mode.
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you’ve got the option to make a run at turn off S mode.
Step 1: Press theWindows+Ikeys together to openSettings.
Step 2: For Windows 11 users, go toSystem > Activation.

For Windows 10 users, go toUpdate & security > Activation.
Step 3: Click theGo to the Storebutton to continue.
Step 4: Then you will be taken to theSwitch out of S modepage.

you’ve got the option to turn off S mode by clicking theGetbutton.
it’s crucial that you notice that this method is not fit for Windows 11/10 Home users either.
Double-click it to chooseNot Configured.
you could try them to fix the issue.