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in, on

Use in as a preposition when providing context such as a learning platform, LMS, software application, or operating system. Use on as described in the Microsoft Style Guide.

Do
In MindTap, open the CNOW app on the toolbar.
Don't
On MindTap, open the CNOW app in the toolbar.
Do
In Canvas, click the assignment. It opens in MindTap.
Don't
On Canvas, click the assignment. It opens on MindTap.