LVM snapshot size 100%, increase default size of 3.91GB

When I backup a bigger data store, the LVM snapshot of 3.91GB are filled to 100% (during the backup) then the job stopped and the snapshot are not cleaned up.
Is there a way to increase the default snapshot size of 3.91GB?

That’s an OS question, right? I don’t think it’s a Duplicati default, however scripts are in lvm-scripts to see.
Unless you’re quite lucky and an LVM expert stops by here, you might do better finding info on the Internet.
Understanding LVM snapshots (create, merge, remove, extend) is an example page on changing the size.
I don’t personally use an LVM system.