❗ Breaking changes in Obsidian 1.5.4 (and newer) - update the plugin to 2.1.7 or newer Obsidian team introduced some breaking changes in File Explorer in a not-backward-compatible way starting from Obsidian 1.5.4.
The custom sort plugin starting from release 2.1.7 was adjusted to work correctly with these breaking changes in Obsidian 1.5.4 and newer. The plugin remains backward compatible, so you can safely update the plugin for Obsidian earlier than 1.5.4
For more details of the observed misbehavior (of not updated plugin) you can go to #131 or #135 or #139