I can not showing any data in arabic language as used to do before

Hi, gsabry-ithumanso.

Let me share some insights into changing the language in QuickBooks Online. This feature is available to the version that you are using which QuickBooks Online international. 

Here's how:
 

1. Click the Gear icon and then choose Accounts and settings.
2. Select Advanced and then go to the Language section click the pencil icon to edit.
3. Our supported languages are English, Chinese, Francais, Italiano, and Español
4. Select Save, and then Done when you're ready.

However, Arabic is unavailable in changing the language but you can change the language using the settings of the browser, here are the steps.

1. At the upper-right of the opened browser, select the vertical ellipsis ⋮. 
2. Select Settings.
3. Select Advanced and then Languages. 
4. From the Language drop-down, select Add languages. 
5. Select the language you want to use. Then, select Add. 
6. Select the vertical ellipsis ⋮ beside the language and then Display Goggle Chrome in this language checkbox.

You can check this link QuickBooks Resource Centre to view an updated feature in QuickBooks Online International.

Let me know if you have questions or concerns in changing the settings of your QuickBooks Online account. I'm always here to help.