You can create guide in the SVG editor to guide your drawing process in Vecta.
To create guide, ensure the Ruler is switched on in your editor. Click and drag anywhere from the ruler (horizontal or vertical) to the canvas. You would see a dashed line appears following your cursor. Release your mouse where you want to place them.
An inactive guide is in blue color while an active guide is highlighted in red. You can remove the active guide by pressing the "Delete" key on your keyboard.
Alternatively, you may also drag a line back to the ruler to remove them from your canvas.