Keyboard shortcut to collapse and expand Favorites bar

Hi anishjp,

I am an independent advisor addressing your inquiry.  

No shortcut key exists to collapse and expand the Favorites bar in OWA.

You will be glad to know that the Microsoft Feedback Team stated in April 2022 that they are working on supporting the keyboard shortcut customization feature.  No rollout timeline was given. Also, the post indicated the MAC environment. I am hopeful it is for the PC as well. 

Add custom keyboard shortcuts · Community (microsoft.com)

Stay tuned.

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Have a good day.

/Teresa

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