In Youform, you can align your form blocks using two ways:
Align Statement blocks: all statement blocks are by default center-aligned. If you want to left-align them, then open any of your statement blocks and on the right side, you will have the option to change the alignment.
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Align any other block type except statement block: this setting can be changed from the design tab. Go to the design tab from the top panel, and on the right side, you will see the alignment option.
This sketch cannot currently be displayed in exports
Thank you pages are always center-aligned. For now, you can't make them left-aligned.