Let us help you on the items you flagged.
1. Vertical Alignment on the Web Version.
Each theme is unique on CSS styling and spacing, if you need to increase the vertical space on the title of Product Add-ons for the desktop version, you can add a margin-top CSS to .zaddon-type-container and add this code to the desktop CSS for the theme.
For example:
.zaddon-type-container
{
margin-top: 25px;
}
Increase the margin value as needed.
2. Align calculations to the left.
If you would like to align the calculations to the left, use the following CSS code.
.zaddon_data {
text-align: left;
}
3. “Add to Cart” button.
This is not a bug. Once the plugin Product Add-ons is activated, yes the text of the button is modified to “Select options”, the text is changed because the customer can now add the options from Product Add-ons. If you have “Add to Cart” only, the Customer is not aware of options being available on the Product. ??
If you really want to modify this button text, you can make string modifications to the Shop.php file in the plugin directory, but we wouldn’t recommend doing modifications unless you are an experienced developer and caution you to make backups before modifying any plugin code.