If this template helps then use it. If not then just delete and start from scratch.
OS (e.g. Win10): Mac
PsychoPy version (e.g. 1.84.x): 2023.2.3
**I decided to study spatial attention with a visual search task, but I didn’t know how to set the location, size, color, etc., of stimuli in Psychopy
First ,open PsychoPy Builder and create a new experiment.
Second,on the Experimental Process panel, select the experimental component to which you want to add experimental parameters.
Then,in the"Properties" panel, find “Position”, “size”, “color” and other properties, and click the “Add experimental parameters” button on the right. In the Experimental Parameter Settings window, enter the parameter name, default value, and description, and select the parameter type (for example, number, text, color).