Hello, @stianand,
Thanks for the access I have checked your issue on your site. Let me explain.
I have found that the shop page on your site is created custom using a custom layout that you created in Elementor. In this layout, you have used a filter widget and this filter widget works like this as it does now on the site. I have checked and confirmed that no option in the filter widget settings can help to achieve the way you want.
Now, to solve this issue you have to set the shop page layout with a sidebar. You can set this by navigating to the Dashboard >> Porto >> Theme Options >> WooCommerce >> Product archive >> From there you can set the shop page layout with a sidebar. After that go to the Dashboard >> Appearance >> Widgets >> In the “Woo Category Sidebar” simply add the filter widgets as per your need. Then check back to your issue by clearing the browser cache. I hope you will get the desired results. I have attached some screenshots below for you to understand better.
https://postimg.cc/w3hRBrqX
https://postimg.cc/Q9qBfBn6
Best Regards,
PThemes Team.