Now, if you apply Select all from the already “filtered” slicer, it brings the values of all clients, not only the one that starts with “a”… as you expected (select all that start with “a”).
It depends on your approach.
By filtering the whole page, all other vis will be filtered. If you want it to be like that, so go for defining a page filter, and you are done.
But, if you just want to filter the table, putting a page filter would not be necessary. And since @ezenunez just said about filtering the table, I thought maybe it is more suitable to just filter the table.
Generally - I turn off ALL of the filters that affect the individual visuals, as it cases confusion for my users.
(I keep hoping for the option to toggle all ‘filters on this visual’ options off with a single tick - but not yet).
So, my filter pane looks like this when in design mode and I click on a visual:
Users are given “filters on this page”, and “filters on all pages” as needed
and in some cases, I turn off the filter pane completely, using only slicers on the page.
This gives my users a good experience without causing as much filter confusion.
Thank you all for your contribution.
In my opinion it is a design problem from Power BI.
If I am the user I would filter the whole page so everything is in sync.
For my users, I will follow Heather recommendation.
I am still new in this Power Bi Journey and I can see there is a lot to learn!