I hope you are well today and thank you for your question.
It displays by category or by specific post IDs but not by tags.
You have to develop custom code to display it by tags.
Developing custom code for custom functionality is beyond the scope of support that we provide here. Please see https://themeforest.net/item/jevelin-multipurpose-premium-responsive-wordpress-theme/14728833/support
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5
Thank you for the information, I will look into this.
For now, when I define a specific category to display posts in the Blog Slider element, it displays all posts, instead of the specific category.
I’ve attached a screenshot displaying my meaning. I’ve also included login credentials if needed.