How does loss functions work in PINN? [D]

I am learning Physics informed neural network (PINN). I am playing with simple 1rst/2nd 1D ODEs and I am calculating the loss functions by adding the initial condition loss and Physics loss (e.g. Regardless of the magnitude of the loss and lambda values, the total loss is a single numeric a value. How does the neural network model predicts if I impose higher weights (lambda) for one of the losses. For instance, lets say, PL = 5, IC_Loss = 3, L1 = 0.6,L2 = 1, then total loss = 6. However, this values 6 can be achieved through several other combinations.