… with a GREEN PROGRESS BAR extending along the bottom?
This happened without prgm-notice.
Perhaps you have hit your computer and now it is fake against you.
Seriously, how do you expect an useful answer if you don’t give any information? OS ? LibreOffice version ? File format ? File size ?
All Libre apps are slow, especially calc. Since 5.x. Currently running 5.3 on a Win 10 2016 LTSB -64bit Acer machine with 12G ram. Small spreadsheets take several seconds to “paint” and cursor ops like area select are slow. Feels like 1994 again. Tried changing Open CL settings to no avail. I’m seriously considering ditching LibreOffice and going back to MS.