how do you change the colour on inputs boxes on Base?

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Again the properties of the control come into effect. On the General tab it is Background color. You can use the ellipsis to help select the wanted color.

It appears that your form was created using the wizard. When this is done, the text control and a label control (the text) are grouped together. You can select one or the other separately by holding down the Ctrl key when clicking on it or by using the Form Navigator. The text is again on the properties dialog as Label.

This is all covered in the LO documentation - click here.

If this answers your question please click on the ✔ (upper left area of answer).