Can anyone explain how to set holidays for the country that the customer is using and set those days as not working for the users in the system?
Firstly tag your employees by country, so I would give them an "England" tag for those getting English bank holidays and "Scotland" for those getting Scottish holidays etc.
Set up a leave type of public holidays, you can give it a meeting type of public holidays too.
create an allocation request for the full number of holidays in the year and leave type public holidays, set the allocation mode to be by tag and choose your "England" employee tag to apply it to.
now for each day that is a bank holiday create a leave request, again do it by employee tag so they all get the holiday together. Do this for all the holidays in the year and that should use up the allocation in full.
What you say make sense for me , but I did everything that you said. But this part "now for each day that is a bank holiday create a leave request, again do it by employee tag so they all get the holiday together" I can not do it, because in my Odoo the Mode is readonly If I go through the menu Leave request... code ( ) In my installation is missing some configuration ?