Mop and Brush Extension

What do I need to enable/disable so that my P10 Pro Ultra extends a mop and a brush to reach edges and corners every time it cleans. I think I've seen it do it just one time.
It's been 2 weeks and dirt just gets pushed to the edges and corners and never gets cleaned up.

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Hello，
Go to "Settings>AI-driven MopExtendTM Settings>Al-driven SideReachTM, AI-driven MopExtendTM, check whether the function is turned on. If not, please turn on this function.

Kindly note there are 3 modes for extension frequency of the side brush and mop during cleaning tasks: Standard, Intellegence and High Frequency. And each mode has a different cleaning strategy. If you prefer the swing out during each cleaning task, it is recommended to choose High frequency mode in "AI-driven MopExtendTM" function.