Needs Answer
Hello. When I click OPEN IN APP on any of my activities, the calculator opens, but I get automatically logged out. If I try to sign in again, the page reloads and I end up signed out again. There is no way to edit the calculator activities currently...
The same question 
I'm not able to replicate your issue.
Can you please try again?
Anyway, I think that to modify an existing app, you need to select Edit Activity, then click on the pencil icon above the app, scroll down the app and select the Edit Applet button.
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