When we apply Arabic content, preaheader isn't available in pane mode in outlook version as you see below, instead it appears View in browser text. If you include any English word along with Arabic, that English word only appears. We also noticed last part of Subject line appear if you have lengthy subject line ( I assume that is because Arabic letter format) Please let me know if you have any way to resolve this issue? Thanks!

Hi there,What do you mean the preheader is not visible in pane mode in Outlook version?I just did a test and as it's supposed to be it's perfectly showing in Outlook (I'm using Mac). Similarly as you are showing in your screenshot.Regarding Subject Line, please be aware that you should limit the number of characters to 50.For Preheader, best practice is to limit with a max. of 80 characters.Feel free to further clarify your question and I'm happy to help.Kind regardsIlona