The EDOC website provides many resources for thesis writing.
In addition, PolyDoc provides an unofficial LaTeX Thesis Template which may be of use. You are of course free to modify this template how you see fit. You can also find the template in Overleaf by searching.
Please note that there is no official or mandatory template to be used. Templates are provided to help writing your thesis. Just remember to comply with the requirements of the Print center (Repro).