Hi,

You can use JS to achieve this.

First you need to extend Form view.

var FormView = require('web.FormView');
var FormController = require('web.FormController');

Then using renderButtons function, you can find

renderButtons: function() {
    this._super.apply(this, arguments);
    if (this.$buttons) {
        var button = this.$buttons.find('button.o_form_button_edit');
    }
}

Now you have the button. Next, you need to check the condition and hide the button. For that

renderButtons: function() {
    this._super.apply(this, arguments);
    if (this.$buttons) {
        if(this.initialSate.data.state == 'closed'){
            this.$buttons.find('button.o_form_button_edit').hide();
        }
    }
}

Regards

Try this...

https://www.odoo.com/forum/help-1/record-rule-doesnt-remove-form-edit-button-179790#answer-179823