a little help if possible, please. I cannot get layered navigation working with search results i.e. no filters? Works perfectly when browsing the website with all filters showing the correct results etc... I checked through the settings including the obvious "Use in search results layered navigation" which is set to "Yes" for all appropriate attributes. Any ideas??? Magento 2.4.3 | Amasty Improved layered Navigation and several others from Amasty.
A couple of months ago I had the same issue. Make sure that default search is set to Elastic search (I used Sphinx which caused the issue). If you are on a development server you might also consider disabling Amasty Improved layered Navigation and see if layered navigation works with search results.
Set Enable Ajax to No in Amasty - Improved Layered Navigation extension. https://nimb.ws/QB4RpO
If you are using Porto Theme then disable Mageplaza Ajax & Mageplaza Layered Navigation extension.