How to keep selected a value inside a selection filter without showing it

[menphis21]

Hi,

I have a table with a column ( Age paramter ) filled in only for some companies and i have a chart graph to compare theses companies

Since of the column is only filled in some cases, i also have to select in a parameter also the (blank) value and also another value to display the graph with all the companies.

So finally,  to display all the companies, the user must select blank value and a specific age...

it can problematic because you can mistakenly  select several ages...

At the moment i add the values selected so that you can check.

I would like to know if there is way to let blank values selected without letting the user select it ( without displaying them)  and give to the user only the choice to select another age ?

Thank you

[menphis21]

Thank you @FreemanZ , thats what i did already, but i dont wont to let the multiple selection, thats why i am asking if there is another way ?

[FreemanZ]

hi @menphis21 

try to keep the blank checked in the filter pane.