Mesh network devices know network conditions better than a sysop, so are designed to operate autonomously. I don’t think you get to choose for this reason!
Battery devices spend most of the time asleep with the radio OFF to save battery - the only way to wake then is to trigger a sensor (i.e. in hardware by physically doing something) or to WAIT.
You might be able to change the sleep time per device, but that will eat batteries.
A cooordinator command for this exists in Z-Wave (Network Heal), but I’ve not seen it referred to in Zigbee.
There is a way to force a Zigbee “sort of network heal” but it’s a tad messy…
The downside is the mesh network is unusable as it is flooded for some time to allow the devices to “traceroute” back to the coordinator and calculate route weightings. For this reason Z-Wave tends to run a recalculation rarely, and in the small hours of the night when there may be less interference - good to get proximity, less useful if you have daytime interference.
If this helps, 
this post!