When the DOM structure of the viewer was updated in PR 18385 it caused the `secondaryToolbar` to accidentally start closing when clicking inside of it, since the `secondaryToolbar` now reside *under* the `toolbar` in the DOM.
**Steps to reproduce:**
- Open the viewer.
- Open the `secondaryToolbar`.
- Try to change document rotation at least *twice*.
**Expected behaviour:**
The document rotation can be changed an arbitrary number of times.
**Actual results:**
The `secondaryToolbar` closes after changing rotation just once.
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