OpenCore boot straight into windows

Hello I have a Xioami notebook pro with single 1 Tb nvme drive. I installed both windows 10 and Mac OS X and used open core to boot. For a while everything worked fine but today when I was booting up my laptop it boot straight into windows and I don’t have the open core boot menu. What can be wrong ? How do I fix it

Thanks

submitted by /u/macguruil
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