If you do not have a Minecraft Realms server, clicking the "Minecraft Realms" button on the title screen takes you to the "Your own server, always online" screen, and clicking "Back" returns you to the title screen.
However, under the same conditions, if you click "Join Realm" on the "Your own server, always online" screen and then click "Back", you are taken to the "You don't seem to have a Realm. Add a Realm to play together with your friends." screen instead of returning to the "Your own server, always online" screen.
Suggestion:
After clicking the "Minecraft Realms" button on the title screen, clicking "Back" should return to the "You don't seem to have a Realm. Add a Realm to play together with your friends." screen, and clicking "Back" again should return to the title screen.
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We're tracking this issue in MC-311391, so this ticket is being resolved and linked as a duplicate.
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