It'll tell you which program is using the discrete graphics card.
After identifying it, right click the program, Run on Graphics Processor, set default processor. This takes you to the NVidia control panel, where you can then add a rule for the program in question and force it to run on the integrated card. Just add an exclusion rule and all is happy.
Yeah IE defaulted to NVidia GPU on mine. I just added an exclusion rule and all is happy.