The force that point to the left (A) is the frictional force on the box.
A vector has both magnitude and direction. This implies that vectors are directional. Both the magnitude and the direction of the vector is important when we are solving the vector.
Now we can see that four forces are acting on the box and all these forces are balanced. This is why the box remains at rest on the table. The force that point to the left (A) is the frictional force on the box.
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