How can I exit power saving mode on my Samsung S6 Edge?

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AC Question

I cannot exit power saving mode on Samsung S6 edge

After activating my Ultra Power Saving mode, I was able to deactivate, however my phone then went into a similar power saving mode, grey scale screen, no apps and no option to exit the mode available on any accessible parts of the settings. Is this a bug? or have I activated a mode I didn't intend to?