hi, 

You can use this module to extend the search limit. this module increase the limit to 10 but you can change the limit number. To use this in your Many2one field(E.g: product_id) use widget="search_more".

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https://apps.odoo.com/apps/modules/15.0/search_more_widget/

Thanks & Regards, 

Brain Station 23 Ltd. 

Mobile: (+880) 1404055226 

Email: sales@brainstation-23.com 

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Hi,

Please refer this post:

https://www.odoo.com/forum/help-1/can-tree-list-views-be-customized-to-show-more-than-80-items-81056

Thanks