How to collapse the inbox bar/column?

Hello @Julia

In New Outlook, the folder pane can be collapsed, although the experience is a little different from Classic Outlook. The layout and customization options are not identical to Classic Outlook, so some behaviors that were available in Classic Outlook may not yet be available in New Outlook.

If you're looking for the previous experience, you may want to switch back to Classic Outlook on the desktop app, where the Folder Pane and Favorites section provide the experience you're looking for: https://support.microsoft.com/office/revert-to-classic-outlook-31dfbaf7-1e17-444e-bc0b-184f1f32c373

If this functionality is important to your workflow, I would also encourage you to submit feedback directly to Microsoft through Help > Feedback in Outlook or post it on Feedback portal. Microsoft actively reviews user feedback when considering future improvements and feature requests. As this is a community forum, we do not have visibility into the product roadmap or the ability to influence feature development directly.

Reference: https://support.microsoft.com/Office/how-do-i-give-feedback-on-microsoft-365

Thank you for your understanding, and I hope this helps.

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