-Select the items you want to stretch (as in your screen shot)
-Shift-click-drag over the area. Those items should now be unselected and everything you don't want to alter should be selected.
-Lock the selected.
-Now stretch using the marquee tool.
-Don't forget to unlock items from previous step.
Marc Corney, Architect
Red Canoe Architecture, P. A.
Mac OS 10.15.7 (Catalina) //// Mac OS 14.5 (Sonoma)
Processor: 3.6 GHz 8-Core Intel Core i9 //// Apple M2 Max
Memory: 48 GB 2667 MHz DDR4 //// 32 GB
Graphics: Radeon Pro 580X 8GB //// 12C CPU, 30C GPU
ArchiCAD 25 (5010 USA Full) //// ArchiCAD 27 (4030 USA Full)