Show all records at page load before filtering

Hi
I have a page with a list of users. I would like to show all records when the page load but have the possibility to filter this list with buttons.
I create a variable. A button click set the variable value to filter results. This works but when the page load, if the variable have no value, there are no records.
I would like to show all records and then filter. It is possible?
Thanks

Use the conditional filtering options in the Query Builder, to only apply the filter if your variable has a value:

As always is perfect. Thanks Teodor.