Good day. How to solve the problem with the Cyrillic fonts in the headers? I took a screenshot to make it clearer https://prnt.sc/rbhb29

Hello there, @irina-podnebesna.

You'll want to change the Cyrillic font to a regular one for the company name.

Here's how: 

1.  Go to the Gear icon then select Account and Setting.
2. Select Company from the left menu.
3. In the Company name section, select the Pencil icon.
4. Make the necessary changes.
5. Select Save, then Done.

I'm adding these articles that might help you in the future: 

• Change your business name, contact info, or EIN in QuickBooks Online
• Import custom form styles for invoices or estimates

Please let me know if there's anything else you need. Take good care.