I run OnlyOffice Document Editor v9.1 in its browser version and need the current two-row ribbon condensed into a single, streamlined row. The new layout must keep both the icons and their text labels so users still recognise each function at a glance. All standard buttons should remain accessible; I am not yet sure whether extra custom tools will be added later, so please build the markup and CSS in a way that new buttons can slot in without breaking the layout. Deliverables • Updated UI code (JavaScript/HTML/CSS) or a plugin/theme that I can drop into the existing OnlyOffice build. • Clear step-by-step instructions so I can reapply the change after future updates. • Confirmation that the single-line toolbar renders correctly in the latest Chrome, Edge and Firefox at common resolutions (desktop).