Currently, the impress can only present from first page. Could it present from the current page?
I would try to implement preseting from current page
Created attachment 162684 [details] current slide show click the red circle to slide show
Created attachment 162685 [details] after click presentation
nienzu committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/online/commit/d660146ee3c16dfad80faf24ac8d20410a02f65f tdf#134546 Implement presentation from current page
nienzu committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/0c9e914dc98179190994ee45405a1b38825cc4bc tdf#134546 let users can present current page when using LibreOffice Online It will be available in 7.1.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
It had been merged.