PSA: Depending on the version you are downloading, a separate installation of cloth config, or LibJF may be required
Respackopts provides resource and data packs with config menus
By default, it provides a custom system for conditional resources, resource expansion and integrates with frex, canvas and fabulous shaders
After installing respackopts, a menu button will appear besides all supported resource packs. No further configuration is needed.
Please head to the wiki for details on how to use respackopts in a pack.