The "Enable Ordered Tracking" checkbox is disabled and greyed out for fields that are not set as track_visibility in the corresponding model. To enable tracking for the Work Email and Working Hours fields in the Employees module, you can create a custom module and add the track_visibility attribute to the fields.

Here's an example of how to add track_visibility to the Work Email field:

Create a new custom module or use an existing one.
In the models directory of your module, create a new Python file and import the necessary modules:

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from odoo import fields, models

Define a new model that extends the hr.employee model:

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class HrEmployee(models.Model):
_inherit = 'hr.employee'

Add the track_visibility attribute to the Work Email field:
 

Save the file and update your custom module.
Install the module and restart the Odoo server.

Repeat the same steps for the Working Hours field.

For custom many-to-many fields created in Odoo Studio, you can follow similar steps by adding the track_visibility attribute to the field definition in the Studio interface. To do this, open the Studio app, navigate to the model that contains the many-to-many field, and click on the field to edit its properties. In the "Advanced Properties" tab, you can add the track_visibility attribute and set it to 'onchange'.