Images are not kept within the writing area.
That is happening in the mobile version.
I’d appreciate your help.
Hey, welcome 
This is probably caused by your theme. For a proper fix, whoever made the theme will need to address the underlying issue.
For a temporary fix, try this.
Go to Admin > Themes.
For your enabled theme (it’ll be at the top of the list on the left) click “Edit CSS/HTML”.
Click the “Mobile” tab and then paste this into the CSS input:
.cooked img {
max-width: 100% !important;
}
Click “Save” at the bottom.