windows 10 update problem

At church we have a projector and tv which run of hdmi cables from dell desktop. All was working well until update,  now when trying to display a song slide or a bible verses  the verse or song lyrics display perfect on the projectors, but the computer monitor shows the same thing, we lose the openlp software operating display, so we cannot see to blank the projectors or see the next slide, if the openlp view is on the monitor its also on the projector screen for everyone to see,  can anyone explain what we needed to do  thanks


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