Hello there, @ramazanova-nadej.

I'm here to help you see the data in your QuickBooks Online account. First, I'd like to know if you've encountered any error messages? If  yes, you can share it in the comment section so that I can provide an extensive troubleshooting method.

As of now, you can perform the browser troubleshooting steps to eliminate any data-related issues. Let's start with using an incognito browser before logging in to QuickBooks Online. Then, check if it's back to normal. If it's showing, you can go back to the regular browser and clear the cache. However, if it's not, you can use another supported browser.

Here are the shortcut keys to access a private browser:

• Google Chrome: Ctrl + Shift + N
• Microsoft Edge & Mozilla Firefox: Ctrl + Shift + P
• Safari: Hold down ⌘ + Option + P 

I've added an article for your future task about tracking your business finances: Run reports in QuickBooks Online.

You're always welcome to tag my name in the comment section about the updates if you're able to see the details on your screen after doing the troubleshooting above. Enjoy the rest of your day.