I've just submitted v2.1.0 of Display Log Files to the plugin section for review; I'll post back here when it's available.

That version:
  1. Corrects a programming error that resulted in the selected log-file's contents not displaying under PHP 7.1.x and later.
  2. Enhances the plugin, moving all configurable elements into your admin's Configuration->Logging, addressing the request from @NCRS 1962.