How to make a picture with large width responsive

Hello Bubblers! I’m currently having issues with my images which is more larger than the 300 width recommended with for mobile responsiveness… I’ve tried creating a group for it (this is more than 300 width) and then I inserted the image into the group, made the image 300 width and then unchecked the make the element (image) fixed width … I thought this would solve the issue since the original image is 300 width however, it isn’t really working out. What can I do to solve the issue without making my image width smaller in width? I look forward to solutions… Thank you!