body.user-edit-php #your-profile .wp-editor-wrap {
    width: 500px !important;
}

body.user-edit-php #your-profile .custom_field_select,
body.user-edit-php #your-profile .select2-container,
body.user-edit-php #your-profile .custom_field_multiple_select {
    min-width: 25em;
}