I put these in bold text label to gain clarity, but if you want to change this, please refer to https://github.com/buymeasoda/soda-theme/wiki/Theme-customisation :
{
"class": "tab_label",
"parents": {"class": "tab_control", "attributes": "selected"]}],
"font.bold": false
},
{
"class": "sidebar_label",
"parents": {"class": "tree_row", "attributes": "selected"]}],
"font.bold": false
}
]