First of all, you should change each desired block region you want manually at Administration >Structure > Block layout Tab and then go to the config export function at:
Administration>Configuration>Development>Configuration synchronization>Export Tab>Single item to export each the block settings for your theme.
Then you should take a look at to the generated YAML files and placed that in a new folder within your theme at /config/install. you then uninstalled the theme and then reinstalled it as the default.
Summary:
1. Install MY_THEME
2. Place the blocks in the desired regions
3. Export config files and remove from them uuid and core config hash
for example Site Branding block block.block.MY_THEME_branding.yml file
langcode: en
status: true
dependencies:
module:
- system
theme:
- DEPENDENT_THEME
id: MY_THEME_branding
theme: MY_THEME
region: site_branding
weight: 0
provider: null
plugin: system_branding_block
settings:
id: system_branding_block
label: 'Site branding'
provider: system
label_display: '0'
use_site_logo: true
use_site_name: true
use_site_slogan: true
visibility: { }
Place config files to MY_THEME/config/optional or MY_THEME/config/install directory (if you're absolutely sure all dependencies are met)
Uninstall MY_THEME and clear all caches
Reinstall MY_THEME again
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