In logos4, windows7. How can I change the Greek text used from Wescott/Hort to BYZ? I use the left arrows to change from English to Greek.
Firstly, is there any reason why you have Logos 4 when a free upgrade to Logos 5 is available (as you are on Windows 7)?
In the general sense of "used" it is a matter of prioritizing BYZ over WH.
Use of "left arrows" implies using Parallel Resource sets to switch between resources, and this involves a collection of resources. So put BYZ and WH in the same Collection and tick the box "Show in parallel resources".
Otherwise please explain more clearly what you want to do.