I expanded on the above - create a .html file with the code below and then import that file into your browser. This bring in 3 buttons: -, +, <calendar>. The - and + buttons will expand or collapse all sprints when on the sprint backlog page. Those same - and + buttons will expand or collapse all epics (to show their tasks) when on the timeline page. The calendar button shows how you can show/hide individual sprints on the sprint page. This is denoted by the sprint number in the HEADER-DROP-xx aria-controls. Substitute the sprint you want to hide by putting in the number, e.g. HEADER-DROP-56 hides the sprint number 56.
Code to put into the HTML file:
<DT><A HREF="javascript: (function() { if (jQuery('.ahoa2g-6').length) { document.querySelectorAll('.ahoa2g-6[aria-expanded=true]').forEach((elem) => elem.click()); } else { location.reload(); } }());" ICON="data:image/png;base64,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" ADD_DATE="1708189309"></A>
<DT><A HREF="javascript: (function() { if (jQuery('.ahoa2g-6').length) { document.querySelectorAll('.ahoa2g-6[aria-expanded=false]').forEach((elem) => elem.click()); } else { Array.from(document.querySelectorAll('[data-testid][role=gridcell]')).forEach((elem) => { elem.dispatchEvent(new MouseEvent('mouseover', { bubbles: true })); elem.getElementsByTagName('button')[0]?.click(); }); } }());" ICON="data:image/png;base64,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" ADD_DATE="1708189389"></A>
<DT><A HREF="javascript: (function() { if (jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-55]').is(':visible')) { jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-55]').hide(); jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-56]').hide(); jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-52]').hide(); jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-51]').hide(); jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-53]').hide(); jQuery('.ahoa2g-0[aria-controls=HEADER-DROP-BACKLOG]').hide(); jQuery('._1e0c1txw._4cvr1h6o._1bsb1ns9._4t3i1ns9._1yt41r6r._19itglyw._2rko7vkz._syazjjyb._bfhk1bhr._16qs1mxi._80omtlke._9h8h11ce._1di61s8i._19lc134c._lcxv1wug').hide(); } else { location.reload(); } }());" ICON="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAIAAABvFaqvAAAACXBIWXMAAAsSAAALEgHS3X78AAAA80lEQVR42mP4jwQ2bd7i4e33nwgAVAZUjCzCAMT37z9YumzFhElTIqPjlFQ1gQyCCKgMqBjIAGoEagcZtH7DJhV1baAE2QioHWgIg5unDyWmQBDQEAZVDR3KDQIawkC5KRDEAAldYmIKF4CE/RA1yM3DGxQ1Ht6QRAuMbyCCJ0gSDIKHKFwbsq6BcBHJYfT8+YvJU6YBEZABsRwohZY5iTIIaATE/0AGkAvJg0By4AyimteoFtjDzCAjU8v8whJKDAJqBxrCkJtfpK1nWFVdR0yZj4nKK6uB2vMKihlevXpdUFRqYm5NXsFoZmlTXFrx+vUbALSyfFivriNxAAAAAElFTkSuQmCC" ADD_DATE="1708189309"></A>
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