In properties > Label > placement > data defined > coordinates:
'x'... when I move the label manually, but what is '$x_at' for? Do they have a huge difference?
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'X' Returns the x coordinate of a point geometry, or the x-coordinate of the centroid for a non-point geometry.
'$x_at (i)' Retrieves a x coordinate of the current feature's geometry where 'i' is the index of point of a line (indices start at 0; negative values apply from the last index), so $x_at(1) returns the x coordinate of the second vertice of the line