Affinity photo straight line selection brush option

[BARBAKANE]

I'm using the selection brush to draw around a picture of a photoframe so I can copy it into another picture. Parts of the photoframe have very little contrast to the background. I just spent 45 minutes refining the selection. I've tried clicking to start the selection then holding cntrl then click again where I want the selection to end, but can't get the selection brush tool to draw a straight lines. I;ve tried a lot of different combinations of keys but still haven't figured it out. Any pointers? I know it must be something obvious but I got nuthin'.

[walt.farrell]

It might help if we had a screenshot of the photoframe, but perhaps the Selection Brush is the wrong tool? Perhaps the Freehand Selection Tool (possibly with the Magnetic option) would do better?

Edit: Or, possibly you should try using the Pen Tool to create your outline. then click Selection on the Context Toolbar to turn it into a selection.

 

[DWright]

To draw straight line selection select the Freehand selection tool then hold down the shift key then click where you want the selection to start and as you move the mouse a straight line will be draw and to draw the next selection click the mouse button, when you let go of the shift key the  selection will automatically link to the star point to complete the selection area.