It sounds like you're still using old/custom toolbars.
If you want to revert to the current defaults, the quickest way is to right-click the empty area on a toolbar, then choose Toolbars > Factory Reset Toolbars.
(You might want to use Settings > Backup & Restore first, to create a config backup.)
If you just want the button to toggle the metadata panel:
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Metadata Pane.dcf (300 Bytes)