Backport: fix(toolbar): chevron buttons size in fullscreen

Maximilian Fußrequested to merge
m.fuss/web-app:backport-fix-chevron-in-fullsize into release/v2.10.x

fix(toolbar): chevron buttons size in fullscreen

(cherry picked from commit b8854021)

Closes #3524 (closed)

Edited by Maximilian Fuß

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