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Since Oreo's update for Galaxy Tab A6 10", I can't find anyway to disable wifi when the screen is off.
With Nougat and oreo on my S7, I have the option to choose how wifi was managed, but on the Tab A6, it's the only setting that is missing (see screenshot below of advanced wifi settings).
Why remove the option? It's now draining battery because of wifi always being on, the tablet has to be charged way more often now.