Your concern with the latest invoice update is understandable, as it has significantly impacted your accustomed routine, mrs_seal. I'll provide more information about this matter and offer a resolution or alternative approach to assist you.

For your first concern, if you want to change the font size of your sales form, such as invoices, follow these steps:

1. Go to the Gear icon, then select Custom form styles. 
2. Locate the Standard template and click Edit. 
3. Pick the Select a different font section, choose your preferred font size. 
4. After that, hit Done. 

When creating the invoice, choose the Standard design instead of the Modern one to ensure that the changes in the font size will be reflected when you print it.
 

For your second and third concerns, changing the column width on the invoice page and adding a custom footer is unavailable in the new layout.

For your fourth concern, if you want to remove the date on your printed invoices. I'll outline how to achieve it: 

1. Hover over the Gear icon once again and click the Custom form styles. 
2. Click Edit. Hover to the Content tab. 
3. Select the second part. Untick the date, then Done. 

 
Again, select the Standard design when creating your invoices so that the changes will show when you print them.

On the other hand, if you want to remove the date column when you create the invoice, click Manage, then Customization. Toggle the date you want to remove. 

Meanwhile, can you please specify where the signature and date were removed? 

As for your sixth concern, the main reason that emails from QuickBooks Online or the 'do_not_reply' address go to the spam folder is that your customers' email domains block @intuit.com. When they receive their invoices, they can select This is not spam or Not Junk. You may inform them to send a sample email to do_not_reply@intuit.com or add quickbooks@notification.intuit.com to recognize the @intuit domain as a trusted site. Refer to this article for more information: Receive important email messages from Intuit. 

I acknowledge all your sentiments. It's certainly not the experience we want you to have. Since the recent updates have not met your expectations, you can send us your feedback. Doing so will allow you to raise your concerns and share your recommendations with the new invoice layout. 

In addition, you can read the frequently asked questions about invoices and estimates to learn more about these changes. 

Moreover, feel free to visit these resources to help handle your invoices in QuickBooks Online:

• See what's new with estimates and invoices.  
• Convert an estimate into an invoice. 
• Record invoice payments.

Sharing your thoughts and suggestions helps us address issues you may have encountered and contributes to making our products better. The various steps and information provided above will ensure that any confusion you have is addressed. If you need additional assistance, I'm available to help.