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Dear Hana Khalilah,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are trying to use Developer mode in Visio web app.
If the understanding above is right, we're afraid that there's no out of box way to achieve this in Visio web app currently, sorry for the inconvenience caused.
We'll need to use Visio desktop app to run Visio in Developer mode, and Visio Plan 2 is required for Visio desktop app.
For your reference: Compare Visio options | Microsoft Visio
Show the Developer tab - Microsoft Support
Run in Developer Mode (Display the Developer Tab) | Microsoft Learn
Run Visio in Developer Mode | Microsoft Learn
Hope the above can help. If the understanding above is not consistent with yours, please feel free to post back and point that.
Your understanding and patience will be highly appreciated. We hope that you are keeping safe and well!
Thanks for your cooperation.
Sincerely,
Rhoda | Microsoft Community Moderator