I use QGIS 3.10 on a MacOS 10.13 environment. I've got a point shapefile layer and a polygon shapefile layer. I want to set a filter to show (and work with) only those points that are within a certain polygon. I've tried the expression
intersects($geometry, geometry(get_feature('layer', 'attribute', 'value')))
that would work in the query builder, but not so in the filter builder. How can it be done?