Launcher window size does not update to new minimum upon upgrade

The bug

Minecraft Launcher version 2.6.10 introduced a new tab in the Minecraft: Java Edition section – Realms. The tab displays the realms to which the player has access, and allows them to launch them directly from the Launcher. With the addition of this tab, the Launcher's minimum window size was increased, supposedly to allow long Realm names to be displayed properly. However, the window size does not increase to this minimum upon upgrading, meaning that first-time visitors to the tab will experience only a portion of the content offered.

A screenshot is attached.

How to reproduce

1. Upgrade the Minecraft Launcher to version b2.6.10
2. Navigate to Minecraft: Java Edition -> Realms
   Content is not fully displayed.