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i try printing in the invoice and i already using document template Boxed in the general setting
and this is the invoice look like
https://imgur.com/Fzi27Cg
it doesn't look like in the preview of the template box
https://imgur.com/H3ZQYVS
this is my setting in general settings
https://imgur.com/JdlIyen
It seems Bootstrap not loaded.
Make sure if any custom qweb report created then call external layout, it will load bootstrap
<t t-call="web.external_layout">
If default odoo module, using in that case check dependency library module and version installed.
Based on odoo version and requirements.txt
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Hello Mark,
It might be changed from any other custom module. If you have installed any other custom modules then uninstall it and check again.
i didn't install any custom module