I have created a bunch of diagonal lines. When I select them I have a rotated selection box which is not what I want. Instead I want what I drew in red:
How to change the selection mode to reflect the red square?
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Frame challenge: seeing what you are needing to accomplish in your floorplan, I'd suggest an alternate workflow - instead of drawing a bunch of lines to make a hatch, use illustrator's pattern fills and make your life easier as the design iterates over time.
If you look at the appearance palette in this screengrab, you'll see that there's one polygon, with a pattern fill, and I've used the checkbox in the transform palette for "Transform Pattern Only" and rotated the pattern 45° to get an angled hatch - then switching back to the default "Transform Object Only" allows you to edit your poly and have the hatch stay perfectly undisturbed.
Transform palette, switch back to "Transform Object Only"
And transform or scale your poly with complete impugnity!
Which to be clear, allows a lot more easily flexibility to delineate, say terrazzo or polished concrete...
Hope this helps.
If the desire is to merely have a squared-off, rectangular, bounding box.. Select the object(s) and choose
Object > Transform > Reset Bounding Box from the menu. This will remove the rotated bounding box and replace it with a squared-off bounding box which will no longer adhere to the rotation of the objects. This means any dragging you do with the new squared bounding box will distort the objects.
If the goal is to keep the angled lines, but only see what is inside the red rectangle, a Clipping Mask may be easier.
Draw your lines, and then draw a rectangle above the lines indicating the area you want visible. Select the lines and this rectangle and choose
Object > Clipping Mask > Make from the menu.
This will hide anything outside the rectangle, and provide a (squared) rectangular bounding box.