Open grafana dashboard with default variables selected

when we open dashboard it is not selecting any one of the variables automatically?

what to do if we want that… if we open any dashboard it should open with any one of the existing variables selected by default?

could you please help me out of this?

For me, this works. Set a variable, set back to what you want for default, press save. Then the dialog box asks if you want to use the current as default value.
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but it is not working for me. like when we are in landing page and if we click any other dashboard it is not opening as we required like it is not selecting any of the variable