Change the rythm of the chord

Hi there

I’m trying this app but i can’t get rid of the chord rhythm which is kind of annoying it sounds good but it doesn’t let me try this app the way i want to, is there are way to make the chord play continuously during the 4 time bar with out a rhythm in the back?

there 1/4 1/8 but no 1/2 or a 1 not even 2 how can i change it??