Question about Cura gcode - Improve your 3D prints - UltiMaker Community of 3D Printing Experts

I have entered my own Start Gcode and End Gcode into the printer settings, see attached screenshots. However, as you can see, Cura also adds its own lines of Gcode that I don't need or want. Does anyone know where these lines come from, and how to prevent them happening?Thanks.

Moving Object: G Code - UltiMaker Cura - UltiMaker Community of 3D Printing Experts

Network connection lost to Ultimaker s5 Pro Bundle · Issue #7457 · Ultimaker /Cura · GitHub

Ultimaker Cura problems with build platform size and overhang support - 3D Printing Stack Exchange

ultimaker cura - Print only part (fraction) of a model - 3D Printing Stack Exchange

My 3D model is printing with missing parts when sliced in Ultimaker Cura - 3D Printing Stack Exchange

how to make this print faster? : r/ender3

G-Code issue with Cura 4.13.1 - UltiMaker Cura - UltiMaker Community of 3D Printing Experts

Circle not round - Improve your 3D prints - UltiMaker Community of 3D Printing Experts

Problems with Cura: Generating incomplete Gcode files - Design for Additive Manufacturing - UltiMaker Community of 3D Printing Experts

Order of generated Gcode - UltiMaker Cura - UltiMaker Community of 3D Printing Experts

UltiMaker S5 3D Printer

Question about Cura gcode - Improve your 3D prints - UltiMaker Community of 3D Printing Experts