How to disable auto-apply of the filter options?
In the module, the filters can be applied instantly or by a button click. Instantly — the filter is applied when selecting the corresponding option. The content of the page is reloaded at the time the option is checked. By button click — the filtering will get applied only after a customer clicks the Apply button:
This option allows selecting multiple filters without being interrupted by reload of a product collection.
The configuration could be found in the general extension settings (Stores → Configuration → Amasty Extensions → Improved Layered Navigation):
The settings are available for both desktop and mobiles. You have the option to use the same mode for both types of devices, or choose to use different modes for each.