In the above Image you can see that I wanted to select one of the canal when the page is reload. search a lot but fond nothing but i have found a way to do this. for that you going to do the following steps.
app.field('canal_name').select(, true, true);
app.field('this is the filed name you selected for filter pane').select([ this is index number you want to select by default like i want 'Shakhab' so shakhab is by default selected], true, true);