Site Manager Ribbon Not Working

[Kiwi]

Hello Community

When selecting 'view' in the ribbon I cannot select to view/hide 'properties' and 'site manager' using version 18.
I can select to view/hide 'toolbar', 'object manager', 'break points' and 'blocks' no problem.
I have downloaded 'resetworkspace' but did not solve this.
I have reinstalled the software but did not solve this.
Please advise.

My many thanks for your help.

[Pablo]

This may be helpful:
viewtopic.php?t=22937

Please note that support for version 18 has ended.

[Kiwi]

Bugger!