Hi @jvejvoda, and welcome back to the forum!
By default, links added to the rich text editor are set to open in a new tab, but you can easily get around that by using the “edit as HTML” option. You can see a working example of this here: Builder.io Fiddle: Open links in same tab
To set the link to open in the same tab, remove the lines rel='noopener noreferrer" target="_blank" from the HTML.
Thank you!
Logan from Builder.io Account Support