I lose admin panel

@asmolyakov Do you have JetPack installed on your site? If so check this previous support topic. Upgrading to the latest version of JetPack should resolve this issue.

If you don’t have JetPack installed can you share your Site Health information and we can investigate further.

I did not set up JetPack.
The problem has appeared after tuning of AMP plugin

### wp-core ###

version: 5.4.2
site_language: en_US
user_language: en_US
timezone: +00:00
permalink: /%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 1
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /home/rockford/carpet-cleaning-rockford.com
wordpress_size: loading…
uploads_path: /home/rockford/carpet-cleaning-rockford.com/wp-content/uploads
uploads_size: loading…
themes_path: /home/rockford/carpet-cleaning-rockford.com/wp-content/themes
themes_size: loading…
plugins_path: /home/rockford/carpet-cleaning-rockford.com/wp-content/plugins
plugins_size: loading…
database_size: loading…
total_size: loading…

### wp-active-theme ###

name: Astra (astra)
version: 2.4.4 (latest version: 2.4.5)
author: Brainstorm Force
author_website: https://wpastra.com/about/
parent_theme: none
theme_features: astra_hooks, align-wide, automatic-feed-links, title-tag, post-thumbnails, html5, post-formats, custom-logo, customize-selective-refresh-widgets, editor-style, woocommerce, amp, widgets, menus
theme_path: /home/rockford/carpet-cleaning-rockford.com/wp-content/themes/astra

### wp-themes-inactive (3) ###

Twenty Nineteen: version: 1.5, author: the WordPress team (latest version: 1.6)
Twenty Seventeen: version: 2.3, author: the WordPress team
Twenty Twenty: version: 1.2, author: the WordPress team (latest version: 1.4)

### wp-plugins-active (3) ###

All In One SEO Pack: version: 3.5.2, author: All in One SEO Team
Thrive Architect: version: 2.5.5, author: Thrive Themes
WP SEO Structured Data Schema: version: 2.6.13, author: WPSEMPlugins

### wp-plugins-inactive (1) ###

AMP: version: 1.5.3, author: AMP Project Contributors

### wp-media ###

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1802
imagemagick_version: ImageMagick 7.0.10-10 Q16 x86_64 2020-05-12 https://imagemagick.org
imagick_limits:
imagick::RESOURCETYPE_AREA: 188 GB
imagick::RESOURCETYPE_DISK: 9.2233720368548E+18
imagick::RESOURCETYPE_FILE: 37500
imagick::RESOURCETYPE_MAP: 188 GB
imagick::RESOURCETYPE_MEMORY: 94 GB
imagick::RESOURCETYPE_THREAD: 1
gd_version: bundled (2.1.0 compatible)
ghostscript_version: 9.25

### wp-server ###

server_architecture: Linux 3.10.0-962.3.2.lve1.5.24.8.el7.x86_64 x86_64
httpd_software: LiteSpeed
php_version: 7.3.19 64bit
php_sapi: litespeed
max_input_variables: 10000
time_limit: 30
memory_limit: 256M
max_input_time: -1
upload_max_size: 192M
php_post_max_size: 192M
curl_version: 7.62.0 OpenSSL/1.0.2k
suhosin: false
imagick_availability: true
htaccess_extra_rules: true

### wp-database ###

extension: mysqli
server_version: 10.2.32-MariaDB
client_version: mysqlnd 5.0.12-dev – 20150407 – $Id: 7cc7cc96e675f6d72e5cf0f267f48e167c2abb23 $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /home/rockford/carpet-cleaning-rockford.com/wp-content
WP_PLUGIN_DIR: /home/rockford/carpet-cleaning-rockford.com/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable`

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@asmolyakov Thanks for providing an update. Providing you have your “Show Toolbar when viewing site” option toggled on can you try and create a new admin user and login with that user? Please inform me if you’re able to view the admin toolbar with that admin user account.

Yes. It works.

I have created new admin user and logined with that new admin user. And bar had appeared.

Thanks for help.

Why first admin user became broken?

@asmolyakov I can’t be sure, I don’t recall coming across this issue previously.

As you shouldn’t have to create a new admin user maybe it’s worthwhile trying to deselecting the toolbar option and saving, before undoing that change using your main admin account.

Let me know if that works for you.