Screen limit exceeded (&1 lines, &2 columns)

What causes this issue?

The message appears either when you move screen elements or blocks, or
when you change the length (number of columns) or height (number of
lines) of a screen element.
Moving
If the system were to move or copy the block to the desired cursor
position, at least one of its elements would exceed the screen border.
Since the cursor position is always the top left-hand corner of the
target block, only the right-hand or bottom edge can be at fault.
Resizing
The screen element would become so big that the right-hand or bottom
edge would exceed the screen border.

How to fix this error?

Moving
Reposition the cursor so that there is enough space to copy or move the
object. If this is not possible, you can cut the selected block and, if
necessary, insert it into another screen. Alternatively, you can choose
F3 or "Deselect" to remove the marking without cutting, moving or
copying the block.
Resizing
Reduce the size of the screen element so that it falls within the
right-hand and bottom edges (maintenance size) of the screen.
If the maintenance size is insufficient, you can increase it on the
"Screen attributes" screen.

Error message extract from SAP system. Copyright SAP SE.