Using Git version control software with IAR Embedded Workbench
I guess this is the wrong question for this forum, but so far I only found one git Gui which is not totally bad. Try gitkraken. And from my experience, most IDE integrations of a DVCS suck, as they only offer a subset of functionality and lack good visualisation.
So my advice is accept to use a second tool. Do not insist on IDE integration.