The Tolerances box:

contains two tolerances used by the global solver: Optimality and Delta.

The Optimality tolerance specifies by how much a new solution must beat the objective value of the incumbent solution in order to become the new incumbent.  The default value for Optimality 1.e-5.

The Delta tolerance specifies how closely the additional constraints, added as part of the global solver’s convexification process, must be satisfied.  The default value for Delta is 1.e-7.