How to add a new Virtual workspace?

[yunusparvezkhan]

How can I add a new workspace? by default it is only one, I can change workspace by super+tab, but how can I add another ???

[SGS]

What can you read about it in the manual for your DE?
What has the search on the Internet revealed?

Please only then read the following

Reporting bugs

and post in- and output from

inxi -Fxxxza

and

[fbodymechanic]

It's in settings. You then add a virtual workspace.

[FGD]

https://userbase.kde.org/System_Settings/Virtual_Desktops

[petsam]

@yunusparvezkhan

I can change workspace by super+tab, but how can I add another ?

You say workspaces but you talk about Activities.
https://userbase.kde.org/System_Settings/Activities