Please help me, How can I change the blue colour into red
That is an icon, and cannot be modified.
If you want to change the color of an object, select it by clicking or tapping on it, then use the displayed style bar (Classic Version) or long tap or right click on it to display its style bar in the mobile apps.
In the apps, you can also modify the settings for an object by selecting the three dots at the end of the row in which the object is defined in Algebra View.
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