The title of the executable is dictated by the title of your *.uproject venture file if you first create your venture and package deal it, so if you have already got an current venture referred to as one thing like “UE4”, you will not be capable of change the title of the executable – it would all the time have the identical title because the title of the venture.

To change it on an current venture, it looks like you will should make a brand new venture with a brand new *.uproject file, copy the outdated venture over to the brand new venture listing, delete the outdated .*uproject file, after which run it once more and repackage it. Alternatively, you’ll be able to rename that *.uproject file after which make any code adjustments to reference the brand new venture title as wanted, relying on in case your venture is blueprint-based or not. (Source)