'Topic details' block is opened by default

Can’t find what it caused. When I open any topic, this block is opened by default:

I would like it to be closed as it is on meta now.

What to check?

Update:
it’s connected with this
https://meta.discourse.org/t/how-do-i-find-the-popular-links-section/44064/3?u=ed_bobkov

Update 2:
as it’s a system core feature, I decide to hide it. Added to CSS:

    .topic-map-expanded, .map .buttons .widget-button.btn.btn.no-text.btn-icon {
    display: none;
    }
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