Hello!
Version TFP - 15. At 14, this problem did not exist.
Menu: Interiors - Catalog - Cabinets - Single Door Base Cabinets.
I'll bet the base. Choose properties. Then select the "Counter Top".
Default width - 1800 mm. Change the width (For example 800mm). Select Depth. Dimension of 800 is accepted. Picture-in properties changed.
Click OK. Size remained the same 1800mm.