Focus on low light

Hi all,
can someone help me remember which are the settings to help my d750 focus in low light situations? There is an af lamp on camera but also an af lamps on my flashhead. Do I recall correctly that doing AF-C will close those assisting lamps right? I find those illuminations to cause issues in wedding parties, especially the flashhead one.

LEt me hear your views on the topic
Regards,
A

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