Fix theme settings link in branding block help text
>>> [!note] Migrated issue
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<!-- Migrated from issue #3561922. -->
Reported by: [pameeela](https://www.drupal.org/user/1431110)
Related to !749
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The branding block has help text linking to the 'Appearance Settings' page to change the logo. But this takes you to the global appearance settings (<code>/admin/appearance/settings</code>), which doesn't actually work. Changing the logo in the global settings does not modify the block, you have to go to the specific settings for your default theme (e.g. <code>/admin/appearance/settings/mercury</code>.</p>
<p>Can we shim this to link to the default theme instead? Otherwise this is insanely confusing.</p>
<p><img src="https://www.drupal.org/files/issues/2025-12-08/Screenshot%202025-12-08%20at%202.12.25%E2%80%AFpm.png" alt=""></p>
> Related issue: [Issue #2852838](https://www.drupal.org/node/2852838)
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