Thanks for your reply.
Here is a part of my layout. On the right, there is an STM32, and on the left, there is an SDRAM. You can notice that there is about 5mm (5 grids) of unused space, and the idea would be to move the SDRAM block to the right to save space. On this picture, I have selected the DRAM block with all components and related vias. As the wires linking it to the right are all horizontal, so that should be easy.
However, if I move the SDRAM block, the horizontal wires are not moved, so I expected them to be resized (their left part shortened). Acting as rubber bands until I finish the move. That's what I meant by resize.
So is there a simple way to do that? I tried the G command that allows in schematic to move a block while keeping connections but there is no such command in layout.