How to change adminlte primary color

The package is using bootstrap4.6, you can check the here.

You may have something like this in your app.scss:

Override these variables' value should able to change the color.

import "@/_variables.scss";

$primary:       $blue !default;
$secondary:     $gray-600 !default;
$success:       $green !default;
$info:          $cyan !default;
$warning:       $yellow !default;
$danger:        $red !default;
$light:         $gray-100 !default;
$dark:          $gray-800 !default;

Edit: It should app.scss