There are a few things you can try to fix Bangla font in Chrome:

1. Make sure that you have the latest version of Chrome installed. You can check for updates by clicking the three dots in the top right corner of the window and selecting Help > About Google Chrome.
2. Make sure that you have a Bangla font installed on your computer. You can download a Bangla font from a variety of websites, such as Google Fonts.
3. Set the default Bangla font in Chrome. To do this, go to Settings > Advanced > Languages. Under the Languages section, click the Add languages button and search for “Bangla”. Click the Add button to add Bangla to the list of languages. Then, click the three dots next to Bangla and select Move to top.
4. Clear the Chrome cache and data. To do this, go to Settings > History > Clear browsing data. Select the Cached images and files and Cookies and other site data checkboxes and click the Clear data button.
5. Disable extensions. Sometimes, extensions can interfere with the display of fonts. To disable extensions, go to Settings > More tools > Extensions. Toggle off the switch next to each extension to disable it.