<p>I've reopened <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="231846481" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/1551" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/1551/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/1551">#1551</a> since I've been able to reproduce the reported problem.</p>
<p>This PR does fix the problem. However, it does so by making the <code>map-ui</code> panel always 50% of screen height, even if it is the only open panel (Currently if the <code>map-ui</code> panel is shown alone, it is full height). For reference, the <code>sidebar</code> is always 50% height on small screens.</p>
<p>So it fixes the problem described, but with the downside that the <code>map-ui</code> panels are always smaller (and so need to be scrolled more often, and options on the layer switcher will be usually hidden).</p>
<p>Perhaps there is an alternative approach that allows the <code>map-ui</code> to remain 100% when shown alone, but 50% when the sidebar is active? I'm not strong enough with CSS to know if that's feasible.</p>

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