A simple way is to increase the grid size from settings - Long press on home screen > Settings > Apps screen Grid > increase the number... . But I would recommend doing this from GoodLock's HomeUp module Install GoodLock> Install Home Up > Home screen > Apps screen Grid > increase the number (has more numbers than default) . Also, you can check this method too - Install GoodLock > Install Theme Park > Icon > Create New > At the bottom you should see down pointing arrow, Click that and Reduce the size > Save > Apply the New Icon Pack > Done
