Why Does LibreOffice Calc Keep Crashing?

LibreOffice 6.2.3, before that 6.1.4. Mac OS X High Sierra.

I have a simple, small text file, 125 records, about 40 fields. I open the thing and try to use it do any simple function, and I get the spinning ball of death, the app “not responding” forever, requiring me to force quit it.

I’ve used MS Excel a ton of times and never had this kind of problem with it. What gives?