Make botton nav bar buttons customisable

[RandomDennisLee]

Is Your Feature Request Related to a Problem?

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Feature Description

Would be nice if bottom nav bar buttons could be customised. I don't need the settings button permanently under my thumb. Ideal behaviour would be if we could set how many buttons there are as well as their function.

Alternative Solutions

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Additional Context

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[cmbarba]

This would be a valuable feature to me as well. I very rarely interact with my inbox and very frequently interact with my saved posts. I practically never search.