There is always hope, they say. But theese people seem also recommend praying, wich didn’t make much impression on my computers…
The current LibreOffice is compiled to run on
macOS 10.12 or newer
Givven the clarity of your description I don’t think any developer would start a thorough research for possible solutions on an OS wich Apple will not support.
I know some people using LibreOffice on their macs, not having more trouble there than any other program (like InDesign). But your computer may be different.
When you come to sites like this, all people seem to have trouble. But this tells not much on actual percentage.
If you ask, if there is a Task-Force to set out on HighSierra-Problems? I guess not.
One can give bug-reports to bugzilla, but this requires some more details, because developers need a point to start. So usually the first is to analyze, if there is something in your file. Then the question is your installation (reset profile, use safe mode, setup-options). Only after this is done “we” start to consider the program is not running on this OS, and why.
It depends on you, if you have hope.