Hi,

In your model, where you need to hide the field optionally, add a new related field or computed field, which compute the value from the other table, then based on this field you can hide the field using the attributes in the XML.

Steps:

1. Define new related/compute field in model A from model B

2. Add this field to corresponding view and keep it invisible

3. Based on the newly added control the visibility of the other field using the attrs in XML
   

Sample:

<field name="page_width" attrs="{'invisible': [('format','!=','custom')]}" />

Reference:

1.   How to Write Compute Field and its Function in Odoo
   

2.   How To Add Related Fields in Odoo
   

3.   Hide Fields Based on Conditions in Odoo
   

Thanks