Hi There
I have downloaded version 8.0.38 and run a yarn install and yarn serve under vue demo1.
I get the default site but no index on left side and no authentication either.

I then tried changing app.vue to dark mode with following change

// Main demo style scss
//@import "assets/sass/plugins";
//@import "assets/sass/style";

// Dark mode demo style scss
@import "assets/sass/plugins.dark";
@import "assets/sass/style.dark";

but now get

There are multiple modules with names that only differ in casing.
This can lead to unexpected behavior when compiling on a filesystem with other case-semantic.
Use equal casing. Compare these module identifiers:
* asset/inline|data:image/svg+xml,%3csvg xmlns=%27http://www.w3.org/2000/svg%27 viewBox=%270 0 8 9%27 fill=%27%23FFFFFF%27%3e%3cpath fill-rule=%27evenodd%27 clip-rule=%27evenodd%27 d=%27M2.06463 4.42111C1.96161 4.22088 1.9809 3.9637 2.12863 3.78597L5.12847 0.177181C5.31402 -0.046034 5.63049 -0.060261 5.83532 0.145404C6.04015 0.351069 6.05578 0.698744 5.87023 0.921959L3.19406 4.14137L5.84414 7.06417C6.03896 7.27904 6.03835 7.62686 5.84278 7.84105C5.64721 8.05524 5.33073 8.05469 5.13591 7.83982L2.14806 4.54449C2.1141 4.50704 2.08629 4.46541 2.06463 4.42111Z%27/%3e%3c/svg%3e

Thanks