How to do it

[Dobartas]

How open Finder and Designer app on workspace?

[markw]

Hello Dobartas and welcome to the Affinity forums
If I understand your question correctly, to jump between open apps on a Mac do one of the following;
1: Hold down ⌘cmd key and then press the ⇥ Tab key once.
As in your screenshot a strip showing all open apps will be displayed.
Move your cursor over whichever app you want to highlight it, and then let go the ⌘cmd key to switch to that app.
2: Hold down ⌘cmd key and then press the ⇥ Tab key once to bring up the strip showing the open apps.
Continue holding down the ⌘cmd key and repeatedly press the ⇥ Tab key to step through and highlight each app.
When the desired app is highlighted let go of the cmd key to switch to that app.

 

[Dobartas]

Thank you so much. That's what I wanted to know.

[R C-R]

FWIW, this MacOS feature called the App Switcher. It has lots of options. Many are very useful but not obvious. There are several online blog topics that discuss this, among them this CNet article.