Hello,

01. You can read our detailed documentation about image alignment and content in the following link:
https://xtemos.com/docs/woodmart/faq-guides/image-size-content-alignment-product-grid/

02. Sorry to say there are no options in theme setting to show specific categories. It requires customization and beyond our support policy.

03. You can click any layer and lining up with the logo.
https://www.sliderrevolution.com/manual/the-canvas-drag-drop-visual-workspace/

Best Regards.