How do I find missing connections between ground planes?

I have never get this DRC error, but for other errors (may be for this one also) when I click them the arrow at PCB pointing for the point related to the error changes its color. It can be difficult to notice if there are lot of error arrows. I think (don’t check it now) that if I zoom in and then click error in the list than PCB is shifted to show this error arrow. It helps to find the right arrow.
In your case there should be also a connection line showing the lacking connection. Manipulating with colors (I think also width of this lines are changeable from some time, but not sure of that) should help to see this one connection line.

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DRC for sure, but it doesn’t give any easy way to locate the problem area (and, if you follow the link to another thread which I gave above, you can see it would be logically very difficult – there doesn’t exist an exact location where the problem is).

You can use ratsnest lines.

Hide all layers in the Appearance → Layers tab. With correct settings the ratsnest line should be shown. This, too, can’t show how to fix the problem, but at least you can pinpoint the area.

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Yes, I know, but it senseless to sort out the mess. If yoy fix the GND plane, then the errors are gone.

IMO you have a poor pouring of GND. Try to change the minimum width in Copper Zone Properties to fully distribute the copper on the PCB.

I believe he knows it: