Summary:
In 1.18.10.28 Beta, the Marketplace sidebar now has a Realms Plus button that brings the user to the Realms Plus menu and allows them to purchase a Realm.

Steps to Reproduce:

1. Launch Minecraft 1.18.10.28 Beta
2. Open the Marketplace
3. Expand the sidebar on the left
4. Click on the Realms Plus button

Observed Results:
The Realms Plus menu opens.

Expected Results:
The Realms Plus button should not be available in the Marketplace sidebar, as Realms are not playable in the beta.

Screenshots: