To show the page under maintenace message, follow these steps:

• Create a blank page and create a region inside and give the title "Page is under maintenance.".
• Create a table app_settings as below:

Create Table app_settings (dev_mode varchar2(1) default 'N');

• Insert a row as below:

Insert into app_settings (dev_mode) values ('Y');
Commit;

• Now open your page no. 2, and in Pre-rendering > Before Header > Create a Branch to redirect to the page you created in the first step and specify the serverside condition Rows Returned and add the below query:

select 1 from app_settings where nvl(dev_mode, 'N') = 'Y'

This will do the job.

Do not change anything in the below cursor. Use as-is:

Cursor C1
   is
   select EMPCD,EMPNAME,LSTSAL,ESEX,EMRTSTS,EDESGN from empmst where
   EDESGN in (SELECT t.column_value
FROM table (Apex_String.Split(:P9944_EDESGN,':')) t
WHERE t.column_value IS NOT NULL);

In the above query, "table" and "column_value" are the keywords, so do not change them.

Yes, the custom attribute is the shortcut 😀.

And I tried increasing the size of icons, but it was not happening.

So you can use the image instead of the icon. To do this, upload small images for buttons in the Shared Components > static files.

Then you can use it in your CSS. Just add one more CSS to your style attribute as below:

background-image: url(#APP_IMAGES#yes.jpg);

Server-side condition is not for this purpose.

To show the name instead of the id, you need to put the join in your report query. Below is an example:

Select a.people_Id, p.name from yourReportTable a, people p
  where a.people_id = p.id;

Then hide the people_id column from the report and show the name column.