Two reasons, maybe more, first are that the widget section in the mobile mode is not displaying, simply hidden, second if you are using a shortcode to place the filter use the filter button shortcode as well – [fe_open_button] also can be a reson that the button at the bottom of the plugin.
Best Regards – Victor
Hi!
I found the solution. I am using Blocksy theme. It was enough to set visibility in settings:
