I am modelig the bracket attached to the wall by one screw. It works as cantiliver. When the horizontal arm of the bracket is loaded, the upper part loses contact with the wall, what is taken into account by the 'Displacement Lower Limit' option set on the entire surface adjacent to the wall.
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Boundary Condition 2
Target Boundaries(1) = 4
Name = "wall"
Displacement 1 Lower Limit = Real 0.0
End