Net Blankets make it easy to apply directives to a group of nets, without having to place a directive on each net.
CircuitStudio doesn't have the tool to place net blankets but you can copy one from the attached SchDoc file and it will work fine.
Although this is a small feature, I find it useful and it's more than e14/Altium have given us this past year.
(That said, please keep this thread related to net blankets, rather than CS bashing!)
https://www.altium.com/documentation/altium-designer/sch-obj-blanketblanket-ad