Hello Erytriel,
After taking a quick look at the issue that you are having. I would suggest using a Grid panel. From there you can change the “Column Span” setting. This will allow the widget to expand into the next column. From there you can simply collapse the widget to the left or right. I have provided an example below.
Here I have created an image that expands when hovered and then collapses the item to the left or right of the image (depending on what column it’s in)
Here I have placed the custom image in a Grid Panel.
I have also provided the project [EaxmpleProject][3]
I hope that this information helps.
Make it a great day