I see, you probably mean a home page.
In the space, navigate to Space Tools -> Overview -> Edit Space Details and you can see field Home page in there. Just type in the name of dashboard you have created (dashboard1) and save.
You can also see that in the documentation there: https://confluence.atlassian.com/doc/set-up-a-space-home-page-829076213.html#SetupaSpaceHomePage-spacehomepageSetanotherpageasyourhomepage
Let me know how it goes.
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