the Format Toolbar should have an Number Format Field (like Font Name) that shows the actual format of the active cell (like Excell).
Another option would be to provide icons for all supported number formats which if included in the format toolbar, highlight for the active cell (similar to Bold, Italic, Unterline). It works already for the provided number formats like DATE or PERCENTILE.
it seems this request was filled long time ago.
Could you please try to reproduce it with the latest version of LibreOffice from https://www.libreoffice.org/download/libreoffice-fresh/ ?
I have set the bug's status to 'NEEDINFO'. Please change it back to 'UNCONFIRMED' if the bug is still present in the latest version.
The bug/enhancement is still actual LO 184.108.40.206, Win 10.
But I can live with the info in the Sidebar which is anyway always open.
I will change it to RESOLVED. If somebody wants to work on it it is stll in the database.