Hi @vovastik
I have released a new update of the plugin which includes the ability to reset all of your Bootstrap settings back to the default. To do this you need to upgrade to the latest version of the plugin, then click on Bootstrap down the left of the WordPress admin. You should see a new sub page in the menu named Reset Settings. Click on that link and follow the instructions.
This action is permanent so, it may be best to export all of your settings first which you can do in the Import / Export section.
I hope this is what you were looking for but if not please feel free to get back in touch.
Thanks
Miles