Ram

I found that my Minecraft launcher updated but it deleted my set RAM allocation and i don't understand the new one i have Windows 8.1 and i have 6 GBs of RAM with a i7 Intel CPU but i can't set a max RAM limit wean i try to join a single player game it Says Minecraft ran out of memory can anyone try to make it so the launcher has a ram option depending on the ram that can be set or some that can be forced set like a drop down menu with this kinda thing

RAM 1GB

RAM 2GB

RAM 3GB

anything like that because its just awful i can't join servers realms and even play single player on default amplified and even flat worlds i have more fun playing Minecraft pe wean this happens.